Honda Civic Performance - JDM Discussion Engine tech, forced induction, springs, shocks, brakes, tires, etc.

what kind of FPR?

Old 20-Sep-2007, 02:33 AM
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what kind of FPR?

for kind of fuel pressure regulator do i need for a turbo set up?
will the factory one work?
is a cheap B&M commandflo ok?
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Old 20-Sep-2007, 08:08 AM
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i'd just leave the stock one
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Old 20-Sep-2007, 09:18 AM
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Not a bad idea to put a gauge on it though, to keep an eye on it.
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Old 20-Sep-2007, 10:47 AM
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if you use a fuel pressure regulator check the pressure before installing it and reset it at the stock setting until you actually need it i dont think you will unless your running high HP
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Old 20-Sep-2007, 11:32 AM
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so whats the point of getting a guage and adjustable FPR just to set it to stock?

Raising fuel pressure is a crappy way of squeezing a little more out of maxed out injectors, instead of raising the fuel pressure, i'd get bigger injectors.....then you'll be running your injectors at a lower duty cycle (which is easier on the injectors) and at a normal/sane fuel pressure (which is easier on the fuel pump).
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Old 20-Sep-2007, 11:41 AM
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Slightly offtopic.

Andrew, say you switch from 240cc to 370cc injectors, do you need to tune the ECU or do anything to the car otherwise?

Thanks
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Old 20-Sep-2007, 12:22 PM
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hells ya you do.
Anytime you switch injectors you need to tune the car, or at an absolute bare minimum get a basemap set up for the larger injectors.
If you use 370cc injectors on an ecu setup for 240cc the 370cc injectors will be dumping way too much fuel b/c the ecu thinks the injectors are 240cc so it keeps them open as long as it would need for the 240s to deliver the right amount of fuel, but if in reality they're 370cc the injectors will stay open for too long, dumping in too much fuel.
Set the ecu up for 370cc injectors and the ecu will shorten the injectors pulsewidth, thus delivering less fuel.
To summarize.
different injectors = tune
different cams = tune
add a turbo/supercharger = tune
raise the compression = tune
build a frankenstein engine (lsvtec or b20vtec) = tune

If you do any of the above mentioned things and don't tune, you're taking a chance on how well the car will run and how safe it will be.
Sure you can install some 370cc injectors on a stock ecu, and it most likely WILL run, but it'll run pretty crappy and smoke lots of black smoke.
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Old 20-Sep-2007, 03:07 PM
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im going to be running 550cc injectors and am hoping for around 250whp on my stock motor.... will that require a fpr? if not and i just need a re-tune will the stock fuel pump be adequate as well?
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Old 20-Sep-2007, 03:31 PM
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Unless you get close to maxing out those 550's, the stock fpr is fine. If you upgrade your fuel pump, I would also install an aftermarket fpr.
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Old 20-Sep-2007, 04:36 PM
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Originally posted by 187Chor
im going to be running 550cc injectors and am hoping for around 250whp on my stock motor.... will that require a fpr? if not and i just need a re-tune will the stock fuel pump be adequate as well?
You do not need an FPR.

You do need a better pump.

550's for 250whp will be absouletly fine.
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Old 20-Sep-2007, 05:13 PM
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Originally posted by zeeman
hells ya you do.
Anytime you switch injectors you need to tune the car, or at an absolute bare minimum get a basemap set up for the larger injectors.
If you use 370cc injectors on an ecu setup for 240cc the 370cc injectors will be dumping way too much fuel b/c the ecu thinks the injectors are 240cc so it keeps them open as long as it would need for the 240s to deliver the right amount of fuel, but if in reality they're 370cc the injectors will stay open for too long, dumping in too much fuel.
Set the ecu up for 370cc injectors and the ecu will shorten the injectors pulsewidth, thus delivering less fuel.
To summarize.
different injectors = tune
different cams = tune
add a turbo/supercharger = tune
raise the compression = tune
build a frankenstein engine (lsvtec or b20vtec) = tune

If you do any of the above mentioned things and don't tune, you're taking a chance on how well the car will run and how safe it will be.
Sure you can install some 370cc injectors on a stock ecu, and it most likely WILL run, but it'll run pretty crappy and smoke lots of black smoke.
Thank you Sir.
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Old 20-Sep-2007, 05:53 PM
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glad i could help
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Old 20-Sep-2007, 06:00 PM
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wouldn't 550cc be overkill for 250whp?
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Old 20-Sep-2007, 06:42 PM
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i heard that if you use a stock fpr, cylinder #1 has a chance of running lean.... how true is this?

bananax i plan on running higher boost once the internal are upgraded by next spring, infact i hope the 550's will be big enough..
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Old 20-Sep-2007, 07:43 PM
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Originally posted by bananax
wouldn't 550cc be overkill for 250whp?
overkill yes. But I'll bet you any money he'll want 300whp in a month of boosting at 250whp.
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Old 20-Sep-2007, 08:23 PM
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650/680cc min if your buying injectors as 550's @ the 300 range is getting close to max duty.
Always go over kill on injectors
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Old 21-Sep-2007, 09:47 AM
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Originally posted by brianmcgaugh

Always go over kill on injectors


Anytime you boost anything, you need to make sure your fuel system is more than able to supply enough fuel. Also it gives you the option to upgrade for more power down the road.
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Old 22-Sep-2007, 07:01 PM
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Stock is fine.
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